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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-27 04:01:08 +00:00
decodebin2: Rewrite EOS-handling code
This is now really threadsafe and improves switching between different groups.
This commit is contained in:
Edward Hervey
Sebastian Dröge
parent
936e87cdcf
commit
9d2bcb08fe
1 changed files with 132 additions and 76 deletions
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@ -433,7 +433,6 @@ static void gst_decode_group_free (GstDecodeGroup * group);
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static GstDecodeGroup *gst_decode_group_new (GstDecodeBin * dbin,
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GstDecodeChain * chain);
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static gboolean gst_decode_chain_is_complete (GstDecodeChain * chain);
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static gboolean gst_decode_chain_handle_eos (GstDecodeChain * chain);
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static gboolean gst_decode_chain_expose (GstDecodeChain * chain,
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GList ** endpads, gboolean * missing_plugin);
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static gboolean gst_decode_chain_is_drained (GstDecodeChain * chain);
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@ -3040,95 +3039,152 @@ out:
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return complete;
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}
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static gboolean
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drain_and_switch_chains (GstDecodeChain * chain, GstDecodePad * drainpad,
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gboolean * last_group, gboolean * drained, gboolean * switched);
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/* drain_and_switch_chains/groups:
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*
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* CALL WITH CHAIN LOCK (or group parent) TAKEN !
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*
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* Goes down the chains/groups until it finds the chain
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* to which the drainpad belongs.
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*
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* It marks that pad/chain as drained and then will figure
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* out which group to switch to or not.
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*
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* last_chain will be set to TRUE if the group to which the
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* pad belongs is the last one.
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*
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* drained will be set to TRUE if the chain/group is drained.
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*
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* Returns: TRUE if the chain contained the target pad */
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static gboolean
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drain_and_switch_group (GstDecodeGroup * group, GstDecodePad * drainpad,
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gboolean * last_group, gboolean * drained, gboolean * switched)
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{
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gboolean handled = FALSE;
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gboolean alldrained = TRUE;
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GList *tmp;
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GST_DEBUG ("Checking group %p (target pad %s:%s)",
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group, GST_DEBUG_PAD_NAME (drainpad));
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/* Definitely can't be in drained groups */
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if (G_UNLIKELY (group->drained)) {
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goto beach;
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}
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/* Figure out if all our chains are drained with the
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* new information */
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for (tmp = group->children; tmp; tmp = tmp->next) {
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GstDecodeChain *chain = (GstDecodeChain *) tmp->data;
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gboolean subdrained;
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handled |=
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drain_and_switch_chains (chain, drainpad, last_group, &subdrained,
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switched);
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if (!subdrained)
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alldrained = FALSE;
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}
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beach:
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GST_DEBUG ("group %p (last_group:%d, drained:%d, switched:%d, handled:%d)",
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group, *last_group, alldrained, *switched, handled);
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*drained = alldrained;
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return handled;
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}
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static gboolean
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drain_and_switch_chains (GstDecodeChain * chain, GstDecodePad * drainpad,
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gboolean * last_group, gboolean * drained, gboolean * switched)
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{
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gboolean handled = FALSE;
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GstDecodeBin *dbin = chain->dbin;
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GST_DEBUG ("Checking chain %p (target pad %s:%s)",
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chain, GST_DEBUG_PAD_NAME (drainpad));
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CHAIN_MUTEX_LOCK (chain);
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if (chain->endpad) {
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/* Check if we're reached the target endchain */
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if (chain == drainpad->chain) {
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GST_DEBUG ("Found the target chain");
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drainpad->drained = TRUE;
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handled = TRUE;
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}
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*drained = chain->endpad->drained;
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goto beach;
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}
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/* We known there are groups to switch to */
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if (chain->next_groups)
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*last_group = FALSE;
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/* Check the active group */
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if (chain->active_group) {
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gboolean subdrained = FALSE;
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handled = drain_and_switch_group (chain->active_group, drainpad,
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last_group, &subdrained, switched);
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/* The group is drained, see if we can switch to another */
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if (handled && subdrained && !*switched) {
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if (chain->next_groups) {
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/* Switch to next group */
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GST_DEBUG_OBJECT (dbin, "Hiding current group %p", chain->active_group);
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gst_decode_group_hide (chain->active_group);
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chain->old_groups =
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g_list_prepend (chain->old_groups, chain->active_group);
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GST_DEBUG_OBJECT (dbin, "Switching to next group %p",
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chain->next_groups->data);
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chain->active_group = chain->next_groups->data;
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chain->next_groups =
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g_list_delete_link (chain->next_groups, chain->next_groups);
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*switched = TRUE;
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*drained = FALSE;
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} else {
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GST_DEBUG ("Group %p was the last in chain %p", chain->active_group,
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chain);
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*drained = TRUE;
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/* We're drained ! */
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}
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}
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}
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beach:
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CHAIN_MUTEX_UNLOCK (chain);
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GST_DEBUG ("Chain %p (handled:%d, last_group:%d, drained:%d, switched:%d)",
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chain, handled, *last_group, *drained, *switched);
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return handled;
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}
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/* check if the group is drained, meaning all pads have seen an EOS
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* event. */
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static gboolean
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gst_decode_pad_handle_eos (GstDecodePad * pad)
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{
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gboolean last_group = TRUE;
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gboolean switched = FALSE;
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gboolean drained = FALSE;
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GstDecodeChain *chain = pad->chain;
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GstDecodeBin *dbin = chain->dbin;
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GST_LOG_OBJECT (pad->dbin, "chain : %p, pad %p", chain, pad);
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pad->drained = TRUE;
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return gst_decode_chain_handle_eos (chain);
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}
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GST_LOG_OBJECT (dbin, "pad %p", pad);
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drain_and_switch_chains (dbin->decode_chain, pad, &last_group, &drained,
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&switched);
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/* gst_decode_chain_handle_eos:
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*
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* Checks if there are next groups in any parent chain
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* to which we can switch or if everything is drained.
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*
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* If there are groups to switch to, hide the current active
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* one and expose the new one.
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*
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* If a group isn't completely drained (i.e. we received EOS
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* only on one of the streams) this function will return FALSE
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* to indicate the EOS on the given chain should be dropped
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* to avoid it from going downstream.
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*
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* MT-safe, don't call with chain lock!
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*/
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static gboolean
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gst_decode_chain_handle_eos (GstDecodeChain * eos_chain)
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{
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GstDecodeBin *dbin = eos_chain->dbin;
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GstDecodeGroup *group;
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GstDecodeChain *chain = eos_chain;
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gboolean drained;
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gboolean forward_eos = TRUE;
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g_return_val_if_fail (eos_chain->endpad, TRUE);
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CHAIN_MUTEX_LOCK (chain);
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while ((group = chain->parent)) {
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CHAIN_MUTEX_UNLOCK (chain);
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chain = group->parent;
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CHAIN_MUTEX_LOCK (chain);
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if (gst_decode_group_is_drained (group)) {
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continue;
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}
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break;
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}
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drained = chain->active_group ?
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gst_decode_group_is_drained (chain->active_group) : TRUE;
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/* Now either group == NULL and chain == dbin->decode_chain
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* or chain is the lowest chain that has a non-drained group */
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if (chain->active_group && drained && chain->next_groups) {
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/* There's an active group which is drained and we have another
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* one to switch to. */
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GST_DEBUG_OBJECT (dbin, "Hiding current group %p", chain->active_group);
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gst_decode_group_hide (chain->active_group);
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chain->old_groups = g_list_prepend (chain->old_groups, chain->active_group);
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GST_DEBUG_OBJECT (dbin, "Switching to next group %p",
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chain->next_groups->data);
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chain->active_group = chain->next_groups->data;
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chain->next_groups =
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g_list_delete_link (chain->next_groups, chain->next_groups);
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CHAIN_MUTEX_UNLOCK (chain);
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if (switched) {
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/* If we resulted in a group switch, expose what's needed */
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EXPOSE_LOCK (dbin);
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if (gst_decode_chain_is_complete (dbin->decode_chain))
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gst_decode_bin_expose (dbin);
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EXPOSE_UNLOCK (dbin);
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} else if (!chain->active_group || drained) {
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/* The group is drained and there isn't a future one */
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g_assert (chain == dbin->decode_chain);
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CHAIN_MUTEX_UNLOCK (chain);
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GST_LOG_OBJECT (dbin, "all groups drained, fire signal");
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g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_DRAINED], 0,
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NULL);
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} else {
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CHAIN_MUTEX_UNLOCK (chain);
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GST_DEBUG_OBJECT (dbin,
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"Current active group in chain %p is not drained yet", chain);
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/* Instruct caller to drop EOS event if we have future groups */
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if (chain->next_groups)
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forward_eos = FALSE;
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}
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return forward_eos;
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return last_group;
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}
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/* gst_decode_group_is_drained:
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